I'd just like to agree with Eric that the M Classics bag is well worth a look, particularly if you're looking for a soft-ish bag that is large enough to swallow a 2 body outfit plus all those other things we often need to carry around: glasses, mobile phone, wallet, passport etc. It's great for travel and beautifully made. Customer service was excellent too. Mine doubles as a brief case and is a good size for A4 documents or my 12 inch ibook.
To give you an idea of how versatile tha bag is, it even swallows my Ebony RSW 45 view camera, complete with two extra lenses and a 6x9 film back. yet it doesn't feel large, and the way it's designed to mould to you is excellent. I certainly prefer it to my Billingham Hadley, which I'd previously used.